Tubular insulator.



PATBNTED MAY 3, 1904.

F. M. LOGKE. TUBULAR INSULATDR.

APPLIoATIoN FILED Nov. 11, 1901.

NO MODEL.

l INVENTOR WITNESSES:

a9 TTDRNEYS.

UNITED STATES 'Patented May 3, 1904.

PATENT OEEicE.

TUBULAR INSULATOR.

SPECIFICATION forming part of Letters Patent No. 758,986, dated May 3, 1904.

Application filed November 11,1901. Serial No. 81,916. (No model.)

To LU whom, it may concern,.- Y

Be it known that I, FRED M. LooKE, of Victor, in the county of Ontario, in the State of New York, have invented new and useful Improvements in Tubular Insulators, of which the following, taken in connection with the accompanying drawings, is a full, clear, and eX- act description.

This invention relates to improvements in insulators, and refers more particularly to tubular insulators which are open at both ends and adapted to receive either the electric conductor or a suitable supporting member.

The object of my invention is to provide a simple and yeificient insulator for general insulating purposes adapted to be used on poles and cross-arms and in the walls and floors of buildings.

Another object is to produce an insulator which is adapted for high-voltage service to prevent any leakage or short-circuits to the support therefor and which may be manufactured at a minimum cost.

To this end the invention consists in thev combination, construction, and arrangement of the parts of an insulator, as hereinafter fully described, and pointed out in the claims.

Referring to the drawings, Figure l is a perspective view of a pair of cross arms or beams and a series of insulators of different forms carried thereby. Figs. 2, 3, and 4 are sectional views taken, respectively, on lines 2 2, Y

3 3, and 4 4, Fig. l.

Similar reference characters indicate corresponding parts in all the views.

It is well known that in the installation of electric light and power systems the general tendency in all departments is toward an increased electric energy or current voltage, and.

I sulator composed of two or more tubes of suitable insulating material*such as glass, porcelain, or other vitreous or glaze substancesarranged one within the other, and fused, glazed, cemented, or otherwise secured together by any insulating material.

In thedrawings I have shown a series of tubular insulators A, B, C, and D, each being different in form or mounting, but having the structural similarity of being composed of a inner, and intermediate tubes l, 2*?, and 3,

each of which may be formed of the same or different insulating material and are secured together by interposed layers 4 and 5, representing the fusing of the adjacent faces of the tubes or layers of glaze, cement, or equivalent insulating material. The outer tube l is provided with a hood or inverted cup 6 and an annular groove 7, the hood 6 serving to protect the underlying parts of the insulator from the elements when exposed to the weather and also serving as a suitable stop or rest for the insulator when used in the oors or ceilings of a building or in connection with any other support, and the annular groove 7 serves to receive a conductor o and a tie-wire d. The inner tube 2 is formed of suitable insulating material and is provided with a lengthwise opening 8 and an annular rib 9, receiving a rod or tie-bolt 10, having a shoulder l1 for engaging the rib 9 and supporting the insulator, although it is evident that the insulator may be otherwise supported and the lengthwise opening 8 used to receive and support an electric conductor-as, for instance, when the insulator is inserted in a floor or ceiling of a building. It is also apparent that this insulator may be used to con- IOO neet crossing' wires and hold them insulated one from the other. The intermediate tube 3 is preferably formed of suitable insulating material and fused, glazed, or otherwise secured to the inner and outer tubes 1 and 2, In the drawings I have shown this tie-rod 9 as connecting upper and lower arms 1Q and 13, which may be the cross-arms of the pole or the parts of a building, the manner of supporting the insulators forming no part of my present invention.

The insulators B and C are substantially identical in construction, one being' secured by a suitable strap or clamp 14 to one of the arms, as 12, and the other being shown as inserted in an opening 15 in the other arm, 13. Each of these insulators is similar to the insulator 1 and consists of outer, inner, and intermediate tubes 16, 17, and 18, of insulating material, secured together by layers or filling 19 and 20, of suitable insulating material, the inner tube being' adapted to receive the conductors b and c. Although I have shown these insulators B and C as arranged in a horizontal position to receive and support horizontal conductors, it is apparent that they may be arranged vertically or at any angle to conform to the direction of the conductor.

The insulator D also consists of outer, inner, and intermediate tubular shells of insulating material open at both ends to receive a supporting-rod E, the homologous sides of the shells being parallel, which may be a conductor, if desired. In assembling the tubular shells of this insulator I lirst cast the inner shell and then mold over the same the intermediate shell and mold over the latter the outer shell. "his insulator is provided with outwardly-flaring ends 21, being of less diameter at its intermediate portion to receive and support a conductor d and its tie-wire CZ. These flaring ends serve to prevent any surface leakage of the current over the insulator, or if there was any tendency to such leakage the liability of a short-circuit from the end edges of the insulator to the supporting' rod or piece would be reduced to a minimum. In order to further protect the pole-mountings, I usually provide a roof or suitable hood 22, which serves to prevent the direct action of the elements upon the insulators and the conductor connections.

The operation of my invention will now be readily understood upon reference to the foregoing description and the accompanying' drawings, and it will be noted that the essential feature of my invention consists in forming an insulator of two or more tubular sections arranged one within the other and cemented, fused, or otherwise secured to each other to form a substantial integral body.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is4

1. An insulator comprising a plurality of shells arranged within each other, each of said shells being' inclined inwardly from its ends.

2. An insulator comprising a plurality of shells arranged within each other, each of said shells being inclined inwardly from its ends, and a tie-rod adapted to engage the innerl shell and support the insulator.

In witness whereof I have hereunto set my hand this 7th day of November, 1901.

FRED M. LOCKE.

I/Vitnesses:

C. A. Mooim, W. A. IfIIGINo'rIIAM. 

